Mining apparatus



Jan. 8,1952 4 Jf F. JOY v 2,581,667

" MINING APPARATUS Filed sept. 4, 194e A e sneeuw-sheet 1 Jan. 8,'1952.1. F. JOY

MINING APPARATUS Filed Sept. 4, 1946 6 Sheets-Sheet 2 Jan. 8, 1952 J F,JQY 2,581,667

MINING APPARATUS Filed Sept. 4, 1946 6 Sheets-She'et 3 J. F. JOY

MINING APPARATUS .I an. 8, 1952 `e sheets-sheet 4 Filed Sept.' 4. 1946]2206222029.- JsepzlYJay Jan. 8, 1952 J, F, Joy 2,581,667

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Patented Jan. 8, 1952 vMTNIN G APPARATUS Joseph Joy, Pittsburgh, Pa.,

Manufacturing assigner to Joy Company, Pittsburgh, Pa., a

corporation of Pennsylvania.

Application September 4, 1946. Serial No. 634.779

13 Claims. (Cl. Z55- 51) This invention relates to mining apparatus andmore particularly to improved mining apparatus for drilling and breakingdown material, such as coal in underground coal mines, thereby todislodge the coal without the use of explosives.

In accordance with the present'day practice of coal in underground coalmines. the coal is usually cut by a coal cutting machine and the coalface is drilled by a coal drill-to provide a series of blast holes forreceiving explosive charges-so that the cut coal may be dislodged fromthe coal seam. The present invention contemplates improvements overprevious mining practice in that the use of explosives andthe attendantobjections and dangers are avoided.

In accordance with the present invention, the cut.

coal is drilled and broken down from the coal seam by a 'self-containedmobile apparatus embodying means for drilling the coal face and forbreaking down the coal, thereby eliminating the objections and dangersencountered in blasting with explosives.

An object of the present invention is to provide an improved miningapparatus. Another object is to provide an improved adjustablesupporting structure for a mining instrument. Yet another object is toprovide an improved self-contained mobile apparatus for drilling andbreaking down the material to be dislodged in an improved manner. Afurther object is to provide an improved combined drilling and breakingdown mechanism whereby the coal may be drilled and thereafter, withoutremoving the drill from the bore hole, a powerful breaking down pressuremay be imparted to the coal to dislodge the coal. A still further objectis to provide an improved drilling and breaking down apparatus embodyingimproved means for supporting and adjusting the drilling and breakingdown mechanism with respect tothe work. Yet another object is to providean improved drillingand breaking down mechanism embodying a rotary drilland an expansible breaker device encircling the drill spindle rearwardlyof the drill head and having improvedconveying means associated with thedrill head for conveying the cuttings created by the drill headrearwardly through the breaker device along the drill spindle. A furtherobject is toA provide an improved adjustable supporting structure `for adrilling tool whereby blast holes may be drilled in the coal face at anydesired location. Still another object is to provide an improveddrilling and breaking down apparatus of the rubber-tired. mobile typeespecially designed for use in trackless mining without-.the aid of aguiding trackway. Yet another object is to provide an improged miningapparatus having improved arrangements and combinations of parts. Theseand other objects and advantages of the invention will. however,hereinafter more fully appear.

In the accompanying drawings there is shown fcr purposes of illustrationone form which the invention may assume in practice.

In these drawings;

Fig. l is a top plan view of a coal mining apparatus constructed inaccordance with an illustrative embodiment of the invention.

Fig. l2 is a side elevational view of the mining apparatus shown in Fig.1, showing the drilling and breaking down mechanism in its loweredposition on the base.

Fig. 3 is a plan view similar to Fig. l, with parts of the drilling andbreaking down mechanism removed to facilitate illustration.

Fig. 4 is an enlarged view in central longitudinal vertical sectionthrough the drilling and breaking down mechanism, illustrating detailsof construction.

Fig. 5 is a cross-sectional view taken on line 5 5 of Fig. 4.

Fig. 6 is a fragmentary enlarged view showing details of the feedingmechanism.

Fig. 7 is an enlarged cross-sectional view taken substantially on line'l-'I of Fig. 2.

Fig. 8 is a longitudinal vertical sectional view taken substantially online 8-8 of Fig. "I, showing parts of the adjustable supportingstructure for the drilling and breaking down mechanism.

Fig. 9 is an enlarged cross-sectional view taken substantially on line 99 of Fig. 2.

Fig, 10 is an enlarged detail vertical sectional view taken on linelll-.l0 of Fig. 9, showing a portion of the steering gear.

Fig. 11 is an enlarged detail vertical sectional view taken on line{|*II o f Fig. 9, showing a portion of the traction wheel drive.

Fig. 12 is a diagrammatic view showing the hydraulic system of themachine.

Fig. 13 is a horizontal section through the valve box, the controllingvalve assembly of the hydraulic system.

Fig. l4lis a vertical section on the plane of the line |4-I4v of Fig.13.

Fig. l5 is a diagrammatic view in plan, showing the mining apparatus inoperating position in a mine.

Fig. 16 is a diagrammatic side view showing the mining apparatus in amine with the drilling and breaking down mechanism in elevated position.

Fig. 17 is a Side view showing the drillirng and breaking down mechanismin coal breaking position in a coal seam.

In the illustrative embodiment of. the invention, there is shown amining apparatus of the self-contained mobile type supported onrubbertired wheels' and designed for use in trackless coal mines andembodying improved drilling and breaking down mechanism for dislodgingthe cut coal from a coal seam without the use of explosives.

The mining apparatus generally comprises a mobile base or chassis I, anadjustable supporting structure generally designated 2 mounted on thebase and amining instrument, herein a combined drilling and breakingdown mechanism, generally designated 3 carried by the adjustablesupporting structure. The mobile base comprises' a base frame 4 mountedon rubber-tired wheels 5, 5 and 6, 6, adapted to travel overthe oor of amine without the aid of a guiding trackway. The front wheels 5, 5 aresteering wheels, and the rear wheels, 6, 6 are traction Wheels. Thetraction wheels may be driven in unison by separate motors 1, Isupported on the base with their axes arranged in alignment and in atransverse vertical plane in which the wheel axes also lie, and thesemotors are preferably of the variable speed, reversible, electric type.The speed reducing transmission connections between the motors and thetraction wheels may assume-various. forms and herein comprise, as shownin Figs. 9 and 11, a helical pinion 8 fixed to each of the motor powershafts and meshing with helical planet gears 9 fixed to shafts journaledon a rotatable planet carrier I0. Fixed to the planet gear shafts arehelical planet gears I I of smaller size meshing with an internalhelical reaction gear I2 secured to a gear housing I3 attached to the.motor casing. Keyed to the planet gear carrier I is a drive shaft I4 inturn keyed to the hub of a traction wheel. The planet carrier I0 isjournaled in bearings supported within the motor head I and the housingI3, as shown in Fig. 9. Electrical control means I6 is provided foreffecting operation of the motors l, l in unison and the motors arepreferably started in series to provide a relatively high startingtorque and are thereafter connected in parallel to give an increaseddriving speed in a well known manner. Under the regulation of thecontrol means I6, the motors may be operated at variable speeds and theplanetary gearings provide a substantial speed reduction between themotors and the wheels. Suitable brake bands I'I cooperating with brakedrums I8 on the wheels are provided for braking the wheels in thedesired manner.

The front steering wheels 5, 5 have their axles I9 swivelled at 20 atthe opposite ends of a trans- Verse front axle 2|, which is pivotallymounted at 22 centrally on the base frame to rock about a longitudinalaxis. Any suitable means may be employed to swing the steering wheels ontheir pivotal mountings, 'and herein the swivelled axles I9 areinterconnected by conventional linkage 23 to a crank 24 pivoted on anupright axis at the bottom of the base frame. This crank is pivotallyconnected to an operating rod 25 extending longitudinally of the basefram'e and pivotally connected at its rear end to an operating screw 26(see Fig. 10); This screw threadedly engages a nut 21 mounted in ahousing 28 secured to the bottom of the base frame. Formed on this nutis a worm wheel 29 engaged by a worm 3 0 keyed.

to a vertical operating shaft 3| to the upper end ofV which is secured asteering wheel 32. Mounted 4 on the top of one of the wheel-drivingmotors 'l is a seat 33 for the operator, so arranged that the operatormay sit in a convenient position with respect to the steering wheel 32and the several control elements of the apparatus. Thus, by operatingthe steering wheel 32, the operator may readily turn the steering wheels5, 5 in one direction or the other,l as' desired.' through the wormgearing and linkage.

The improved adjustable supporting structure 2 comprises a lowerhorizontal circular frame 34 (see Fig. 8) xed to the base framerearwardly of the front wheels, and swivelled at 35 on the frame 34 is alower horizontal turntable element 36 having projecting upwardlytherefrom spaced vertical side plates 3l. Pivotally mounted at theirforward ends on these side plates at 38 are pairs of parallel motionarms or links 39, 39 in turn pivotally connected at 40 at their rearwardends to vertical side plates 4I on a frame 42. An upper horizontalturntable 43 is swivelled at"44 on the frame 42. A hydraulic jackcylinder 45 is pivoted at 46 on the side plates 31 in alignment with thefront pivots of the lower arms 39, 39 and contains a reciprocable piston45 having its piston rod 41 pivotally connected at 48 to the upper armsor links 39, 39. When uid under pressure is supplied to the jackcylinder, the piston is moved to swing the arms upwardly to vary theelevation of the upper turntable while'the turntable axis always remainsvertical. By trapping the iiuid in the cylinder 45the arms may be lockedin adjusted position, and when fluid is discharged from the jackcylinder, the arms may be lowered. A pairA of parallel horizontalhydraulic cylinders 49, 49V are attached to the side plates 31,011 thelower -turntable 36 and contain reciprocable pistons 50 having theirpiston rods projecting rearwardly and carrying sheaves or pulleys 5I. Acable 52 is attached at its ends to the rear cylinder heads 53 andpasses around the sheaves 5I with its intermediate portion lying in anarcuate groove 54 extending about-the peripheral edge on the stationarybottomvframe 34 and centrally xed to the latter. Similar par.- allelhorizontal hydraulic cylinders 55, 55 are attached to the side plates 4Ibeneath the upper turntable 43, and reciprocablein these cylinders arepistons 56 having their piston rods projecting forwardly and carryingsheaves' 'or' pulleys 51;.`l A cable 58 is attached at its endsv to thefrontcylinder heads 59 and passes around the sheaves- 51 and has itsintermediate portion lying in an arcuate groove 60 extending about theperipheral edge ofthe upper turntable 43 and-centrally iixedto theturntable. The drilling and breaking down mechanism 3 is mounted on theupper turntable. It is accordingly evident that whenrfluid underpressure is supplied to one of the lower cylinders 49 and dischargedfrom the other, the lower turn-- table element 36 may be turned aboutits swivel 35 in one direction or the other to swing .thel parallel armstructure 39 horizontally toward one side of the base. By supplyingfluid under-pressure to one of the cylinders 55 anddischarging fluidfromthe other, the upper turntable 43 be 'turned in one direction or ,theother about its swivel 44 to swing-the drilling and breaking downmechanism 3 horizontally into different angular positions with respectto-the base. Byfftrapping'- the `huid in the cylinders, thel arm,structure and drilling and breaking mechanism may be locked in adjustedposition. The means for controlling the fluid supply to the-severalcylinders above-.de-- scribed willbelater explained Now referring morespecically to thedrilling and breaking down mechanism 3, it will benoted that pivotally mounted at 6| on a transverse axis on upstandingside plates 62 of a frame E3 secured to the upper turntable 43 is anelongated, open-centered guide frame 64 which overlies the base frame.This elongated guide frame is swingable in a vertical direction about'its pivotal mounting on the upper turntable by means of hydraulicdouble-acting jacks 65 having their cylinders 66 pivotally connected tothe side plates 62 and containing reciprocable pistons B1 having theirpiston rods pivotally connected to the guide frame 64. By means of thesejacks, the guide frame 64 may be tilted upwardly or downwardly asdesired, and by trapping fluid in the cylinders, the guide frame may belocked in adjusted position. The combined drill and breaker is. slidablymounted on the guide frame and includes a rearwardly located motor 68having its power shaft connected through a conventional speed reducingunit 69 to a drill rotating shaft or spindle 'IIIl extendinglongitudinally centrally within a stationary outer tube or tubularhousing 1I secured at its rear end to the motor casing. This-tubularhousing is made up of alined ,tubular sections 12 and 13, and a collar14 welded to the rear end of the front section is threadedly secured tothe front end of the'rear section for rigidly uniting the sections.Attached to the front end of the drill spindle is a rotary drill head ordrill bit having cutting teeth 16. The drill shaft or spindle 10 hasspiral conveyor vanes or flights 11 secured thereto toprovide a conveyorfor conveying the cuttings created by the drill bit rearwardly throughthe tube 1l to discharge through a rearwardly located bottom dischargeopening 18. The motor casing has lateral-guides 19 engaging thelongitudinal guideways of the guide frame 64 and the tube 1| is slidablyguided in a front guide 80 which also has lateral guides 8| slidablyengaging the guideframe guideways. -Suitable stop lugs 8| are arrangedat the front end of the guide frame 80 for hunting forward movement ofthe drill and breaker. Surrounding the front tube section 12 of thetubular housing is an expansible tubular breaker in the form of a rubberbag 82 secured at its ends to the tubular housing by means of inner andouter collars 83 and 84, the former welded to the. ends of the front.tubular section and the latter surrounding and embedded in the ends ofthe rubber bag. Thus iiuid tight iointsfare provided between the rubberbag and the tubular housing at the ends of the bag. Threaded on theforward end of the front housing section is a. collar 85 arrangedbetween the lfront end of the bag and the rear side of the drill bitL asshown in Fig. 4. Threaded on the front end of the front. housing sectionin advance of the. collar 85 is a bell-mouthed member 86 which serves.toV direct the cuttings created by the drill bit into the tubularhousing toward the receiving end of the spiral conveyor. 'Ihe drill bitis of such size as to form a bore hole of a diameter -suiiicient toreceive the expansible breaker as the drill bit forms a bore hole in thematerial to be broken. The drill and breaker unit per seis beingclaimed' h1 a divisional application, Ser. No. 14,057, led March 10.1948.

Various means may be employed for feeding the associated drill andbreaker longitudinally along the guideways of the guide frame 64. Themeans shown in the drawings for accomplishing this purpose comprises a.hydraulic cylinder frame.

88 arranged longitudinally at one side of the guide frame 64 andcontaining a recprocable piston 89 having its piston rods SDF and 90B.extending forwardly and rearwardly through the opposite heads of thecylinder. The opposite piston rods each carry at their free ends a pairof sheaves or pulleys, those at the rear of rod 90B being numbered 9IR"and 9IR", and those at the front motor casing, and to a lateral lug BSFor SSR, as

the case maybe, secured to the guide frame 64. A desirable reeve for thecables is, using as an example the cable 94B, from a point of attachmenton the lug 95R on the motor casing, around the sheave 93B, outwardly andaround the sheave SZR', forwardly and around the sheave SIR', thenrearwardly and around the sheave 92R, then forwardly and around thesheave 9 IR", and then rearwardly to the connection to the stationarylug SBR. Accordingly, when fluid under pressure is supplied to one orthe other end of the feed cylinder, the drilling and breaking means maybe fed at a speed substantially higher than the speed of the feedpiston, either forwardly or rearwardly along the guide frame, as

desired. The valve mechanism for controlling fluid iiow to the feedcylinder will later be described, and when the iiuid is trapped in thefeed cylinder, the drilling and breaking means may be locked in adjustedposition. A conduit 91 is connected to the interior of the breaker bag82 and leads rearwardly along the exterior of the tubular housing to asuitable supply of liquid under pressure so that the rubber bag may beexpanded to effect its breaking down function when desired.

The hydraulic system, shown diagrammatically in Fig. l2, comprisesa-llquid pump 98 driven by a motor 99 arranged at the front end of thebase frame and having its intake connected by a conduit |00 to a liquidtank 20|. Mounted on the base frame rearwardly of the rear tractionwheels is a horizontal Valve box |82 having parallel bores containingreciprocable control valves |03, |04, |95, |05, |81 and |08, preferablyof the balanced spool type. The valve box has parallel dischargepassages |09 and I l0 connected together by an end passage i I I whichis in turn connected by a discharge conduit II2 back to the tank IUI.Arranged Alongitudinally between the discharge passages in the valve boxis a supply passage ||3 communicating with the passage H4 connected by apressureconduit IIS to the discharge of the pump 98. The supply passage|I3 of the valve box is communicable, under the control of a valve IIB,with one of the discharge passages |09 so that the pressure in thesystem may be manually controlled as desired. This valve ||6 is of theconical type and is urged toward its seated position by a spring I I1.Connected to the valve stem is an operating rod H8, in turn pivotallyconnected to a hand lever H9, con'- veniently located near thevoperators station, whereby the pressure control valve may be'readilyoperated. VThe pressure in .the system may be regulated by varying theamount of communication of the supply passage ||3 with the dischargepassage and is automatically limited by the presence of the spring ||1.The bore in the valve box containing the valve |03 is connected by acircuit |2| to the conduit 91 leading to the interior of the breaker bag82, and the valve may be controlled to connect the conduit 91 witheither the supply passage ||3 or with the discharge passage ||0. Thevalve box bore containing the valve |04 is connected by conduits |22 and|23 to the opposite ends of the feed cylinder 88 so that either end ofthe feed cylinder may be connected to the supply passage while the otherend is connected to a discharge passage to effect either forward orrearward feed. The valve box bore containing the valve is connected byconduits |24 and |25 to the opposite ends of the tilt cylinders 66 sothat huid under pressure may be supplied to either end of the cylindersto eiect tilting of the guide frame 64 either upwardly or downwardly.The valve box bore containing the valve |05 is connected at its oppositeends by conduits |25 and |21 respectively to one end of each of thecylinders 55 to eiect rotation of the upper turntable 43 in onedirection or the other. The valve box bore containing the valve |01 isconnected by conduits |28 and |29 to one end of the cylinders 49 so thatthe lower turntable 36 may be turned in one direction or the other. Thevalve box bore containing the valve |08 is connected by a conduit |30 tothe lower end of the lift cylinder 45 so that the parallel arm structure39 may be swung upwardly as desired. As previously stated, the severalvalves may be positioned to trap the liquid in the several cylinders tolock the parts adjusted thereby in their adjusted positions.

Arranged in a horizontal chamber |32 within the rearward portion of thebase frame is a horizontal cable reel |33 for winding in and permittingpaying out of an electrical conductor cable for the electric motors 1,68 and 99 in a manner well known to those skilled in theI art. The frontand rear wheels of the mobile base are provided with suitable guards |34and |35 to protect the operator, and headlights |36 are arranged at theopposite ends of the base. Control switches |31 and |38 are provided forstarting the pump motor 99 and the drill motor 58, and these controlswitches are also conveniently located with respect to the operatorsstation. The electrical control means |6 for the traction motors 1 alsohas a conveniently located control lever |39.

The general mode of operation of the improved mining apparatus is asfollows. The apparatus may be moved about the mine when practicable at arelatively high speed under the propulsion of the ltraction wheels 6driven by the motors 1, and steering of the apparatus may be eiected bythe front steering wheels 5 under the control of the steering wheel 32.When the apparatus is travelling through relatively sharply curved minepassageways, the traction motors 1 may :be operated to effect propulsionof the apparatus at a relatively slow speed under the control of theelectrical control means I6. When the coal face is reached and theapparatus is located in the position shown in Figs. and 16, the wheelbrakes |1, IB may be applied to hold the apparatus in a stationaryposition. It will be understood that the coal face has been previouslyundercut, as at |40, as shown in Fig. 16, by a conventional coal cuttingmachine in a well known 8. manner. When the apparatus is positioned. asshown with respect to the coal face, the .lifting jack 45 may beoperated under the control of the valve |08 to swing the parallel motionarms 39. upwardly to elevate the drilling and breaking down mechanism 3as desired. The swing cylinders 49 and 55 may then be operated under thecontrol of the valves |01 and |06 to swing .the arm structure llaterallyon the base to locate the upper turntable 43 in the desired position ateither side of the base and to swing the drilling and breaking downmechanism horizontally into'.= the desired angular position, asindicated in dot-H. ted lines in Fig. 15. The tilting jacks. GEfmaythenbe operated under the control of the valve |05 to tilt the drilling andbreaking down mechanism upwardly as indicated in dotted -lines in Fig.16. When the drill bit is located in.the.de sired position with respectto the coalface, the switch |38 may be operated to start the drillingmotor 58,* thereby rapidly to rotate the drill bit; and fluid underpressure may be supplied to the feed cylinder 88 under the control ofthe valve |04 to feed the drill bit into the coal. As the borehole'is'formed in the coal by the drill bit, the expansible breakermember 82 enters the bore hole, so that when the bore hole is-completed,the breaker assumes the position shown in 16. Fluid under pressure maylthen be conducted through the conduit 91 -under the control of thevalve |03 to the interior of the breaker bag 82 to' expand the latter,thereby to apply a-fpowerful breaking down force tothe coal tovdislodgethe coal in the manner shown -in Fig. 17.- Priori-to the coalbreaking operation, the fluid 'lin-the' cylinders 48, 55, 66 and 88 may,iiUdesired,` be dis-- charged so that as the coal is-brok'en down,.th'edrill and breaker may move freely,` thereby to; prevent bending of thedrill spindle and'possible damage to the associated parts. -Afterthebreaking down operation, the feed maybe reversed -to' retract thedrill bit and breaker from -thecoal face. By suitably adjusting theparallel supporting arms and upper and lower turntables-and.v by tiltingthe guide frame, the drill and breaker may be moved laterally andvertically relativeto'- the base to locate the same in various positionswith respect to the face of the coal; and the drilling and breaking downoperations may be .re-L peated in each position of the drill andbreaker; completely to dislodge the coal from the coal face above theundercut. Upon completion ufl the drilling and breakingdown.operations,the'` wheel brakes may be released and the apparatusvmay be propelled rearwardly away from the coal4 face. l f

As a result of this invention, an improved min.- ing apparatus isprovided for drilling and breaking down the coal inan'undergroundmine,there' by to dislodge the coal from the solid without the -use ofexplosives. vBy mounting the drill' and breaking down mechanismcna-mobile base and by the provision of the improved adjustablesupporting structure for the drilling and breaking down mechanism, theapparatus may' be 4readily moved about the mine and quicklyadiusted intothe desired drilling and breaking' down position; By associating thebreaking down with the drill, the expansible breaking -down member mayenter the bore hole formed. by. the drill, and upon completion of thedrilling operation, the breaking down member may-be ex-, panded todislodge the coal in an extremelyE 4ax--l peditious manner. 'I'heapparatus is not tml-y.`

readily mobile and ilexible Vin-:ii'dj115K.@51511211135.18;

Ialsoirelatively simple and rugged' in design, well adapted to' meet thesevere demands nf service in a coal mine. Other uses and advantages ofthe improved mining apparatus will be clearly apparent to those skilledin the art. Whilezthere is in' this application speciilcally describedone form which the invention mayassume in practice, itwill be understoodthat the invention may be modified 'and embodied in vari` ous othervforms without departing from its spirit or the scope ofthe appendedclaims.

What I claim as new and desire to secure by Letters Patent is: -1.'In amining apparatus, an adjustable supporting structure vfor a mining'instrinnent comin combination, a mobile base having pairs of front andrear wheels and :a frame .carried by said wheels, a horizontal turntablemounted on vsaid base frame rearwardly of said front wheels and locatednearer to the front end of said base than to the -rear end thereof, aparallel motion arm structure carried by said turntable'and extendingrearwardly above said base frame, a horizontal turntable carried by saidarm structure and disposed nearer to the-rear end of the base than tothe front 'end-thereof, an elongated guide frame :for guiding the mininginstrument toward and from the work and pivotally mounted on said secondmentioned turntable to tilt in vertical planes with respect thereto,said guide frame extending vlongitudinally above said base frame andtiltable on its pivotal mounting relative to said second mentionedturntable into a position wherein its forward portion is locatedintermediate said front wheels, and a motor driven mining instrumentmounted on said'g'uid frame and movable longitudmally-back and forththerealong. 2L Ina mining apparatus, an adjustable supporting structurefor a mining instrument compris'ing, in combination, a mobile basehaving front and rear wheels and a frame carried by said wheels, an armstructure pivotally mounted on said -base frame rearwardly of said frontwheels to swing'horizontally and in vertical planes with respect to saidframe, said arm structure extending rearwardly above said base frame, asupport swiveled on the rearward extremity of said aim structure toturnrelative thereto about an upright' axis, an elongated guide framefor the mining instrument pivotally mounted on said swiveled support totilt in vertical planes with respect thereto, lsaid guide frameextending forwardly from said swiveled support above said base frame andtiltable into a position wherein its forward portion lies intermediatesaid front wheels,l and a motor driven mining instrument mounted on saidguide frame for -movement longitudinally back and forth therealong.

3. In a mining apparatus, an adjustable supstmcture for fa mininginstrument comprising, in combination," a mobile base having frontandrea'r wheels and a frame carried by said wheels, an arm structurepivotally mounted on said base to swing horizontally and in verticalplanes with respect to 4 said frame, said -arm structure extendingrearwardly above said base frame, a support swiveled on the rearwardextremity 'of said arm structure 'to turn relative thereto about anupright axis, an elongated guide frame for the mining instrumentpivotally mounted on said swiveled support to tilt in ver-- tical planeswith respect thereto, said guide frame extending forwardly from saidswiveled support above 'said base frame and tiltable "into aA positionwherein its forward portionA is located intermediate said front wheels,a motor driven mining instrument mounted on said guide frame formovement longitudinally back and forth therealong, and feeding means forsaid instrument carried by said guide frame for feeding said instrumenttherealong toward and from the work.

4. In a mining apparatus, an adjustable supporting structure for amining instrument comprising, in combination, a mobile base having frontand rear wheels and a frame carried by said wheels, an arm structurepivotally mounted on said base frame rearwardly of said front wheels vtoswing horizontally and in vertical planes with respect to said frame,said arm structure extending rearwardly above said base, a supportswiveled on the rearward extremity of said arm structure to turnrelative thereto about an upright axis, an elvi-:ngated guide frame forthe mining instrument pivotally mounted on said .swiveled support totilt in vertical planes with lrespect thereto, said guide frameextending forwardly from said swiveled support above said baseA frameand tiltable into a position wherein its forward portion is locatedintermediate said front wheels; and a driving motor for the instrument-guided on said frame for movement back and forth therealong.

5. In a mining apparatus, an adjustable supporting lstructure for amining instrument comprising, .in combination, a mobile vbase havinglfrontend rear wheels and a frame carried by said wheels, an armstructure pivotally mounted on said base frame rearwardly of said frontwheels to swing horizontally and in vertical planes with respectthereto, said arm structure extending rearwardly above said base, asupport swiveled on the rearward extremity of said arm structure to turnrelative thereto about an upright axis, an elongated guide frame for themining instrument/pivotally mounted on said swiveled support to tilt invertical planes with respect thereto, said guide frame extendingforwardly from said swiveled support above said base frame and tiltableabout its pivot into a position wherein its forward portion is locatedintermediate said front wheels, a driving motor for the instrumentguided on said frame for movement back and forth therealong, and meansfor feeding said motor and the instrument back and forth along saidguide frame.

6. In a mining apparatus, an adjustable supporting structure for amining instrument comprising, in combination, a mobile base having frontand rear wheels and a frame carried by said wheels, al frame swiveled onsaid base frame rearwardly of said front wheels to turn about an uprightaxis, a parallel motion elevating structure carried by said swiveledframe, a third frame swiveled on said elevating structure to turn abouta parallel axis,` said elevating structure always maintaining said axesin parallelism irrespective of the elevated position of said secondframe, an elongated guide frame for the mining instrument pivotallymounted on said second frame to tilt in vertical planes with respect tosaid iirst frame, said guide frame being tiltable about its pivot into aposition wherein its forward portion is located intermediate said frontwheels, and a motor driven mining instru--l ment mounted on said guideframe for movement longitudinally back and forth relative thereto.

'7, In a mining apparatus, an adjustable supporting structure for -amining instrument comprisingjin combination, a mobilev base having frontand rear wheels and a frame carried by said Wheels, an adjustable framestructure pivotally mounted on said base frame rearwardly of said frontwheels to swing horizontally and in vertical planes with respectthereto, an elongated guide frame for the mining instrument, means forpivotally mounting said guide frame on said adjustable frame structureto swing horizontally and in vertical planes with respect thereto, saidguide frame being tiltable about its pivot into a position wherein itsforward portion is located down between said front wheels, and a motordriven mining instrument mounted on said guide frame for longitudinalmovement back and forth therealong.

8. In a mining apparatus. an adjustable supporting structure for amining instrument comprising, in combination, a mobile base having frontand rear wheels and a frame carried by said wheels, an adjustable framestructure pivotally mounted on said base frame rearwardly of said frontwheels to swing horizontally and in vertical planes with respect to saidframe, an elongated guide frame for the mining instrument, means forpivotally'mounting said guide frame on said adjustable frame structureto swing horizontally and in vertical planes with respect thereto, saidguide frame being tiltable about its pivot into a forwardly anddownwardly inclined position wherein its forward portion is located downbetween said front wheels, a motor driven mining instrument mounted onsaid guide frame for v movement longitudinally back and forththerealong, a source of fluid under pressure embodied in the apparatus,fluid operated devices for swinging said frame structure, fluid operateddevices for swinging said guide frame, uid operated devices for feedingsaid mining instrument back and forth along the guide frame, and controlmeans on said base for controlling the flow of fluid under pressure fromsaid source to said several fluid operated devices.

9. In a mining apparatus, the combination comprising a mobile basehaving pairs of front steering wheels and rear traction wheels, saidbase including a frame supported by said wheels, a supportswivellymounted on said base frame rearwardly of said front steeringwheels, an arm structure pivotally mounted on said swivelled support toswing relative thereto and extending rearwardly above said frame, asecond support swivelly mounted on the rear extremity of said armstructure, an elongated guide frame pivotally mounted on said secondsupport and extending longitudinally above said base frame and havingits forward portion disposable when said guide frame is tilteddownwardly intermediate said front steering wheels, and a drilling toolmounted on said guide frame and movable back and forth longitudinallytherealong.

10. In a mining apparatus, the combination comprising a mobile basehaving pairs of front steering wheels and rear traction wheels, saidbase including a frame supported by said wheels, a support swivellymounted on said base frame rearwardly of said front steering wheels, anarm structure pivotally mounted on said swivelled support and extendingrearwardly above said frame, a second support swivelly mounted on therear extremity of said arm structure, an elongated guide frame pivotallymounted on said second support and extending longitudinally above saidbase frame and having its forwardv portion disposable when tilteddownwardly inter- 12 mediate said front steering wheels, a drilling toolmounted on said guide frame and movable back and forth longitudinallytherealong, fluid operated means for independently turning v'saidsupports respectively about their swivel mountings, fluid operated meansfor tilting said guide frame relative to said second support and forholding the same in tilted position, fluid operated feeding means formoving said tool along'. said guide frame, a motor operated pump on saidbase frame, and control valve means for individually controlling fluidflow from said pump to' said several fluid operated means.

1l. In a mining apparatus, the combination comprising a mobile basehaving pairs ofvfrout steering wheels and rear tractionwheela: said baseincluding a frame supported by said wheels, a support swivelly mountedon said base 'frame rearwardly of said front steering'wheels, an armstructure pivotally mounted on said swivelled support t'o swing relativethereto and extending rearwardly above said frame, a second sll'DDOrtswivelly mounted on the rear extremity of said arm structure, anelongated guide frame pivotally mounted on said second support andextending longitudinally above said base frame and having its forwardportion disposable when said 4 guide frame tilted downwardlyintermediate said front steering wheels, a drilling tool mounted on saidguide frame and movable back and forth longitudinally therealong, saidswivelled supports being turnable on their respective swivelledmountings and said arm structure being tiltable to vary the angularposition of said guideqframe both laterally and in vertical planes withrespect to said base frame.

12. In a mining apparatus, the combination comprising a mobile 'basehaving pairs of fifront steering wheels and rear traction wheels,l saidbase including a frame supported by said Awheels, a support swivellymounted on said baseframe rearwardly of said front steering wheels, anarm structure pivotally mounted on said swivelled support to swingrelative thereto and extending rearwardly above said frame, asecondvsllPPOrt swivelly mounted on the rear extremity of said armstructure, an elongated guide frame pivotally mounted on said secondsupport and exguide frame including a fluid cylinder arrangedlongitudinally along one side of said guide frame and containing areciprocable piston having oppositely extending piston rods, andmultiple reeve. cable and pulley, speed multiplying connections betweensaid piston rods and the opposite ends of said guide frame respectively.

13. In a mining apparatus, the combination comprising a mobile basehaving pairs of front steering wheels and rear traction wheels, saidbase including a frame supported by said wheels. a support swivellymounted on said base-frame rearwardly of said front steering wheels, anarm structure pivotally mounted on said swivelled support to swingrelative thereto and extending rearwardly above said frame, a second*support swivelly mounted on the rear extremity of said arm structure,an elongated guide frame pivotally mounted on said second suppOrt andextending longitudinally above said base frame and 13 having its forwardportion disposable when said guide frame is tilted downwardlyintermediate said front steering Wheels, and a drilling tool mounted onsaid guide frame and movable back and forth longitudinally therealong,said arm structure comprising parallel motion arms, and a fluid cylinderconnected between said rst swivelled support and the upper one of saidparallel arms for swinging said arms in vertical planes about theirpivots and for holding said arms rigidly in adjusted position.

JOSEPH F. JOY.

REFERENCES CITED UNITED STATES PA'I'ENTS Name Date Joy July 30, 1918Number Number Number Name Date Levin Apr. 12, 1921 Foltz Oct. 26, 1926Cliord May 31, 1927 Joy Dec. 1, 1936 Osgood Feb. 28. 1939 Noble Mar. 21,1939 Stoltz July 23, 1940 Osgood Oct. 15, 1940 Chandler Oct. 28, 1941Austin et al. Aug. 4, 1942 Osgood Nov. 16, 1943 Knoizen et al. Jan. 23,1945 FOREIGN PATENTS Country Date Germany Aug. 21, 1896 Great Britain1931

